Icon set on an Outlook folder with MAPIFolder.SetCustomIcon does not scale properly on high DPI screen

Asked Sep 20 '22 at 14:31

Active Sep 22 '22 at 15:06

Viewed 36 times

I am trying to set an icon to a folder from VSTO Outlook add-in using approach similar to what described here: How to programmatically set a custom icon on an Outlook search folder? (i.e. Outlook Folder SetCustomIcon)

It is working, but fail in Outlook365/Windows11 setup with high-DPI screen. With scaling set to 250% icon of any size for some reason takes only top-left part and looks like this:

And when I drag Outlook window on external display with 125% scale it becomes this:

On 100% screen same approach working without issues.

Is it Outlook bug or there is a way to make it respect DPI settings?

In Windows10/Outlook 365 16.0.15601.20148 32-bit it is working even with 200% scaling, but only if one monitor is present in the system.

edited Sep 22 '22 at 15:06

asked Sep 20 '22 at 14:31

Sergey Belikov

It is not clear when and where you run the code for setting up an icon for the folder. – Eugene Astafiev Sep 20 '22 at 14:44
But it sounds like a product issue, so I'd suggest opening a support case with MS instead. – Eugene Astafiev Sep 20 '22 at 14:46
Will try to open ticket. Thanks. I am using this in Outlook VSTO add-in. – Sergey Belikov Sep 22 '22 at 14:22
It doesn't matter what kind of add-in you are developing, I've asked about the time when the icon is set in the code - startup, shutdown event handlers and etc. Don't forget to update the post if you receive any meaningful explanation from MS. – Eugene Astafiev Sep 22 '22 at 14:25

Icon set on an Outlook folder with MAPIFolder.SetCustomIcon does not scale properly on high DPI screen

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